DE924808C - Circuit arrangement for step switching relays in telecommunications systems, in particular telephone systems - Google Patents

Description

Circuit arrangement for step switching relays in telecommunications systems, in particular Telephone systems In telecommunications systems are in order to save switching means '' so-called step relays are often used, the armature of which, depending on the strength: of the magnetic field generated in each case, only some of the spring contacts or all of them Contact springs actuated. The different strength of the magnetic field is due to the level of the excitation current for: the relay winding or by switching on different rated windings of the relay achieved.

With such step relays up to now: the holding circuit: des Relay for weak excitation by its own, closed during full excitation Contacts prepared so. that in the transition from full excitation to the state of weak excitement there was a risk of complete disconnection, if not for an exact adjustment of the relay contacts. This defect will eliminated according to the invention in that the step relay when switched on is fully excited and initiates a switching process through which independent of dien Contacts of the step relay a circuit for: Preparing its weak excitation is closed and that when the switch-on circuit is interrupted during the transition from full: excitation to partial excitation the circuit for weak excitation is closed, whereby .other switching operations are brought about.

In the drawings there are various exemplary embodiments of the subject matter of the invention shown. Fig. I shows a schematic diagram of the relay and the circuits controlled by him, while in Fig. 2 a slightly modified circuit is shown to achieve the various states of excitation; Fig. 3 shows the Application of the relay circuit make the invention for one with electromotive Individual drive equipped group selector.

In Fig. I, U represents a step relay which is fully excited when the contact ih is closed by hand or by some remote-controlled means via the contact 2, x and: its contacts 3u I, 4u II and 5'c II closes. The winding I of the relay X is switched on via the contacts 3u I and 5 u II, which puts its winding II into a holding circuit via its contact 6 x and a normally closed contact 7 z and heribeifühxt a certain switching process. At the same time it opens its contact 2 x and closes the contact 8 x; so that the relay U via .this contact and -its own contact 42 'H remains excited. If the contact ik is opened and the contact 9 k is closed, the relay U drops out and cuts off the excitation circuit for the winding I of the relay X. This, however, remains until its holding circuit for the winding II at contact 7 z is interrupted. As soon as the armature of the relay U has reached its resting position, the contact iou II is closed and thus a new circuit for the relay U from the + pole of the battery via contacts 8 x and io u II, resistance Wi, contact 9 k and via the The winding of the relay U to the --pole of the battery is established. As a result of the high-ohmic resistance Wi, the current flowing over this path for the winding of the relay U is low, so that the armature is only partially attracted and, finally, can operate the slightly adjusted make contact 3 u I, while the with u II designated contacts remain in the rest position shown. Relay Y is switched on via contact 3 ui and the normally closed contact iiu II: t, which initiates another switching operation. If the relay U is designed as a slowly falling relay, it does not drop out after its first response if the contact ik is briefly opened; it therefore remains energized for the duration of a series of pulses when the contact k is actuated in a pulsed manner. Only when the contact ik is opened for a longer period of time does it drop out and initiate the other switching process by actuating the relay Y when it responds again in the first stage.

In FIG. 2, only the circuits for the relay U are shown, which correspond to those of FIG. I except for the resistance Wi. Instead of this resistor, a counter-winding II of the relay U is switched on in FIG. If the relay U falls after the circuit for its winding I ah has been interrupted, both windings I and II of this relay U are switched on via the contacts 8 x, io u II and 9 k. These are so dimensioned that the field excitation by one winding slightly exceeds that of the other, so that a weak field arises, the anus can operate the slightly adjusted normally open contact 3 u I (Fig. I), while the contacts io u II and ii 2b II remain closed.

A practical application of the relay circuit shown in FIG. 1 is shown in FIG. This shows a group selector with an individual electric motor drive. Such voters have two exciter magnets M i and M 2 offset from one another by 90 °, in front of whose poles a DTehanleer is mounted, which drives the selector arms ma, mb, mc and md of the selector via a gear train. By switching on the field magnets alternately, the armature is set in rotary motion and stopped by switching on both magnets at the same time. If the voter is connected via the wire c from an upstream connection device, e.g. B. a first Gruppenwälh.ler occupied, -so speaks about the closed in the rest position of the selector contact i2 mo to relay C and prepares the selector's test circuit by closing its contact 13 c and contact 30 c.

If the calling station sends out number current impulses, relay A responds at the first current impulse via Lehungsader a and contact 14mo and switches on the delay relay V, which is switched on via contacts 15a, 16via o and 17 p II. This is fully excited, therefore closes its contacts i 8 v II, i 9 v II, 2o v II and 22i v I and opens the contact 22 v II. The selector is initially not switched because both magnet M2 via contacts 2i vI and m2 and, in parallel, magnet 311 via switching arm md. In position o and contact 23a are excited. If the relay A drops out at the end of the first number current surge, it interrupts its contacts 15 a and 23 a, the first of which is the circuit of the relay V and the latter, the circuit of the field magnet M i The relay V, designed as a delay relay, remains during the brief opening of its contact 15 a excited, while the now only excited field magnet M2 of the selector moves the switching arms by one contact, the drive shaft opening the contact m: 2 and closing the contact mi. At the same time, the drive shaft of the selector opens the contacts 1 2 m O, 14 mo and 16 mo and closes the contact 26 mo. The circuit for relay A remains through 2o v II and that of relay C through contact 36 c and winding II. The excitation of the relay TT during the following current surges is sustained for 26 mo and i 9 v II. If the switching arm md reaches the next contact, then both field magnets are connected in parallel via the contacts 13 c, 18 v 1I, 24 a and S, ehaltarm md. So the voter stops at the first contact.

If the relay A is re-excited with the next current surge, contact 24a cancels the parallel connection of the field magnets -M i and M2. These are now only switched on alternately under the control of contacts mi and 1n2 until the switching arm md reaches position 6 in which both field magnet rivets are again connected in parallel, via the switching arm ind in position 6, contacts 25a, 18v2 and 13c. The voter remains in this position until the second power surge has ended. If the relay fails A then off, the contact 25 a is opened and the contact 24a is closed, so that the selector JI i and M 2 into the position ii passes under the action of the mutually switched field magnets to the position i vielfacb; gesc: is held. The switching arms ma to ind are thus on the first contact of the second decade.

If the series of currents is thus ended, the relay h drops after a short time and places itself across contacts 17 P II, 26 11a o, 27 v II and 28a. and via the high resistance Wi into a weak excitation circuit. The armature of the relay is only attracted so far that the slightly adjusted normally open contact 2i vI closes, while the contacts marked vII remain in the rest position shown. If the first line of the second decade is occupied, magnet M i is switched on via contacts 21711 and in i, which moves the contact arms one step further and opens contact mi and closes contact m 2, via which the field magnet is now M 2 is energized and causes a further switching of the switch arms of the selector. This alternating switching on and off continues until the switching arm inc has found a free downstream connecting line. If this is the case, the following test circuit is established: + -pole of the battery, contacts 29a, 28vII, windings I and 1I of the test relay P, Kointali: t 30 c, switching arm mc and via -the occupancy relay of the downstream selector to the --pole , the battery. The R2l.ai@s P is also designed as a step relay and closes its slightly adjusted contact 31 PI very quickly, via which the field magnets M i and 11Z2 of the selector are switched in parallel and cause its immediate shutdown. A short time later, contacts 32 P II, 33 P II and 3q.P II are also closed. The first two keep the voice wires a and b to the switching arms ma and inb, while the last one shorts the high-resistance winding I of the relay P to block the downstream selector. At contact 17 P II, the circuit for relay h is interrupted, which drops out and interrupts the excitation current for the field magnets at contact 21 v I.

If all outputs are occupied in the selected decade, then when the last connection line of this decade is reached, winding II of relay A is excited via control arm and field magnets M i and 312 are simultaneously connected in parallel. The voter stops, and the relay A gives the calling subscriber a busy signal in a known manner, not shown here. If the conversation is over and the calling subscriber hangs up his receiver, the circuit is practiced the seizure wire c .opened and: thus the relay C is brought to waste. It interrupts the circuit for relay P and for the occupancy relay of the downstream selector at contact 30c. The relay 1r is placed in a weak excitation circuit via the contacts i 7 P II, 26 m o, 27 v II and 28a and, by closing its KOnta1-, teS 21 vI in the manner described above, causes the selector to continue for so long until the switching arm md reaches the o-position shown. Right now are! the magnets M i and M 2 connected in parallel via the switching arm md and contact 37 c, while the selector contact 26mo is opened and the kel: ais V brings to waste. It opens his. Contact 21 v1 and thus switches the field magnets M i and M 2 off.

However, the use of the relay circuit according to the invention is not limited to the selector circuit described above, but can be used anywhere take place, where inevitably a switch to a control process as a function of, the termination of another is to be made.

Claims (6)

PATENT CLAIMS: i. Circuit arrangement for step relays, iis in telecommunication systems, , in particular telephone systems, characterized in that the step relay at when it is switched on, it is fully excited and initiates a switching process (x) the independent of the contacts of the step relay, a circuit for its weak Excitation is closed in preparation (2x), and that when the switch-on circuit is interrupted (i k) during the transition from full excitation to partial excitation of the circuit for .the weak excitation is closed (i o u II), whereby other switching processes (y) erb be introduced. 2. Circuit arrangement according to claim i, characterized in that d: aß in the excitation circuit of the relay (U, h) a the response current @ weakening resistor (Wi) is switched on (Fig. I and 3-). 3. Circuit arrangement according to Ansp-ruchi, characterized in that .the excitation circuit of the relay (U) against each other switched windings (UI and U II) which are dimensioned so that in At the core of the relay only a weak field is created (Fig. 2), .I. Circuit arrangement according to claim i for group wäbler in telephone systems for switching from the Numbers on the free choice, characterized in that as a delay relay trained control relay (U) of the selector through the surge receiving relay (A) during the recording of a number of short-term current impulses: e is excited, after they have ended, see a contact activated during the voter setting (26 m o) switches on in a weak excitation circuit and rides the actuated Contact (2r vI) initiates the free choice of the voter (Fi: g.3). 5. Circuit arrangement according to claim q. for voters equipped with a single electric motor drive, thereby characterized in that -the working circuit for the field magnets (M i and 1V12) both with the number as well as with: the free choice via the same contact (2z vI) des Stenerrelai-s (Y) runs. 6. Circuit arrangement according to claim 5, characterized in that that, the contact (2z vI) this control relay (h) both at full and at the weak excitation of the relay is closed.